package com.changgou.system.filter;

import com.changgou.system.utils.JwtUtil;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.List;

@Component
public class AuthorFilter implements GlobalFilter,Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1. 获取请求
        ServerHttpRequest request = exchange.getRequest();

        //2. 则获取响应
        ServerHttpResponse response = exchange.getResponse();

        //3. 如果是登录请求则放行
        String path = request.getURI().getPath();
        if (path.contains("/admin/login")) {
            return chain.filter(exchange);
        }

        //4. 获取请求头
        HttpHeaders headers = request.getHeaders();
        System.out.println(headers);

        //5. 请求头中获取令牌
        String token = headers.getFirst("token");
        System.out.println(true);

        //6. 判断请求头中是否有令牌
        if (StringUtils.isEmpty(token)) {
            //7. 响应中放入返回的状态吗, 没有权限访问
            response.setStatusCode(HttpStatus.UNAUTHORIZED);

            //8. 返回,就是拒绝访问
            return response.setComplete();
        } else {
            try {
                //9. 如果请求头中有令牌则解析令牌
                JwtUtil.parseJWT(token);

            } catch (Exception e) {
                e.printStackTrace();
                //10. 解析jwt令牌出错, 说明令牌过期或者伪造等不合法情况出现
                response.setStatusCode(HttpStatus.UNAUTHORIZED);

                //11. 返回,就是拒绝访问
                return response.setComplete();
            }

            //12. 放行
            return chain.filter(exchange);
        }
    }



    @Override
    public int getOrder() {
        return 0;
    }
}
